Burning Question: Kim Kardashian's been doing an awful lot of international traveling of late. Don't doctors tell expectant moms to cut out the flying, especially this late in a pregnancy? — D. Pike

Kardashian has indeed been jet-setting for two; in a little over a month, the pregnant reality star has boated in Greece, traversed bridges in France with baby-daddy Kanye West, and rocked out to a Beyonce concert in London before heading back to American soil.

According to our rather rocky math, Kardashian is due sometime in June or July. Conclusion: Kardashian has been logging some serious third-trimester mileage.

Before we could even get an obstetrician on the blower to answer your questions, their female publicists began to sound off. One had delivered a premature baby, and she'd wished that her doctor had restricted her travel to the first five months of her pregnancy. Another rep told me she's currently six months along and had been instructed by her obstetrician not to fly after seven.

So could Kardashian be enjoying some sort of super-pregnancy?

Nope. Turns out, Kim's travel plans were all vetted by her doctor

See, not every OB/GYN makes the same recommendation when it comes to traveling while pregnant.

"That's OK," Dr. Adeeti Gupta (who, like the other doctors we spoke to, doesn't treat Kardashian) told us after we described Kim's recent travels and due-date window, "as long as the pregnancy has been normal and risk-free, if you're only flying in short stretches — five to six hours — keeping yourself hydrated and keeping the legs moving occasionally during flight."

Why is that?

Because "pregnancy is a hypercoagulative state," says Shannon Hardy, an OB/GYN at the Methodist Hospital in Houston. "You can get clots a whole lot more easily when you're pregnant, so if the flight is a smooth one, we do want you to get up to keep the blood flowing in your legs."

And drink plenty of water, of course.

"There is nothing inherently harmful about air travel" during late pregnancy, notes Dr. Keith Eddleman, director of obstetrics in the Department of Obstetrics, Gynecology and Reproductive Science at The Mount Sinai Medical Center in New York. But many doctors frown on traveling in a third trimester simply because "it separates you from your care provider."